/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package edu.capex.javaee.session;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author Acer
 */
public class WelcomeServlet extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            HttpSession session = request.getSession();
            String username = session.getAttribute("username").toString();

            out.println("<html>");
            out.println("<head>");
            out.println("<title>Welcome Servlet</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h3>Welcome Back. " + username + "</h3>");
            if (session == null || session.isNew()) {
                out.println("<h4>You're not logged in</h4>");
            } else {
                out.println("<h1>Login application using Session Tracking</h1>");
                out.println("<p>Thank you, you are already logged in.</p>");
                out.println("<p>Here is the data in your session.</p>");
                Enumeration<String> nombres = session.getAttributeNames();
                while(nombres.hasMoreElements()){
                    String nombre =  nombres.nextElement();
                    out.println("<p>name="+nombre+" value="+session.getAttribute(nombre)+"</p>");
                }
            }
            out.println("</body>");
            out.println("</html>");
        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
